JPS589342B2 - Kanetsu Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device for gas, liquid, etc., and prevents dew condensation especially when the combustion amount is small by changing the combustion gas passage area of a heat exchanger according to the combustion amount control of the burner. It is something.

FIG. 1 shows a conventional heating device such as a hot air heater. In other words, air sent from a fan 1 and flowing through a blower tube 2 is mixed with gas absorbed by the low pressure action of a low pressure generator 3 on the way, and is then heated to a burner 4. and burns here.

The combustion gas from the burner 4 flows through the heat exchanger 5 and is discharged from the exhaust port 6.
The air that flows around the outside is heated and converted into warm air.

7 is a gas path, and 8 is a zero governor. The function of this zero governor 8 is to supply gas in response to the amount of air blown by the fan 1.

In other words, in the device shown in Fig. 1, the combustion amount of the burner 4 changes by controlling the rotation of the fan 1, and the ratio of air to gas, the so-called air-fuel ratio, is set to be constant regardless of this change in the combustion amount. be.

By the way, in the conventional device described above, the combustion gas passage area of the heat exchanger was constant regardless of the burner combustion amount, so the second
As shown in the figure, as the burner combustion rate decreases, the thermal efficiency increases, eventually reaching the dew condensation point, which causes corrosion.

Also, if you try to make the thermal efficiency below the condensation point when the combustion amount is small, the thermal efficiency during the large combustion amount will be too low.If you further increase the air-fuel ratio during the small combustion amount, you can improve the thermal efficiency, but on the other hand, the combustibility of the burner There was a problem in that the temperature of the flame deteriorated, causing the flame to blow out.

The present invention aims to solve such conventional problems, and embodiments thereof will be described below with reference to the accompanying drawings.

That is, as shown in FIGS. 3 to 5, the present invention provides a heat exchanger 5.
The combustion gas passage 9 is divided into two passages 9a and 9b by a partition plate 10, and one passage 9b is opened and closed by a shutter 11.

Note that in FIGS. 3 to 5, the same parts as in FIG. 1 are given the same reference numerals and explanations are omitted.

The shutter 11 is connected to a shaft 12 rotatably provided in the diametrical direction of the heat exchanger 5, and when the combustion amount of the burner 4 is set to be large, the shutter 11 is connected in the same direction as the partition plate 10, that is, the combustion gas Both passages 9 are parallel to the flow direction of
a, 9b are opened, and in the case of small combustion, it is rotated by 90 degrees to close the passage 9b.

The shutter 11 is constructed integrally with a shaft 12 rotatably provided in the diametrical direction of the heat exchanger 5, and is rotated via the shaft 12 by a motor or solenoid disposed outside the heat exchanger 5. It is something that will be done.

In the above configuration, the fan 1 rotates and combustion air is supplied to the burner, and at the same time gas is sucked and mixed and supplied to the burner 4, combustion is performed in the burner, and the high-temperature combustion gas is exchanged for heat. Heat exchange is performed in the chamber 5 and the exhaust is discharged, but when the combustion amount is large, the shutter 1 integrated with the shaft 12
1 opens the combustion gas passages 9a and 9b in the same direction as the partition plate 10 provided in the heat exchanger, that is, parallel to the flow of combustion gas, and guides the combustion gas into both passages for heat exchange.

Next, in the case of a small combustion amount, the number of revolutions of the fan 1 is reduced by means such as phase control to reduce the combustion air supplied to the burner 4 and the amount of gas sucked in by it. The shaft 12 is rotated 90 times by a moke or a solenoid to close the combustion gas passage 9b and guide the combustion gas from the burner 4 to the combustion gas passage 9a for heat exchange.

As explained above, in the present invention, the area of the combustion gas passage through which the combustion gas passes in the heat exchanger, that is, the heat exchange area, is changed depending on the amount of combustion in the parna, and It is possible to prevent heat exchange efficiency from increasing too much and prevent dew condensation and corrosion caused by it.

Further, in the burner, even if the air-fuel ratio is kept constant regardless of the amount of combustion, dew condensation does not occur in the heat exchanger, so combustion can be stabilized.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional heating device, Fig. 2 is a diagram showing the relationship between combustion amount and thermal efficiency, Fig. 3 is a sectional view of a heating device showing an embodiment of the present invention, and Fig. 4 is a diagram showing the relationship between combustion amount and thermal efficiency. FIG. 5 is a sectional view taken along line AA in the figure, and FIG. 5 is a sectional view taken along line BB in the figure. 4... Burner, 5... Heat exchanger, 9... Combustion gas passage, 10...
Partition plate, 11...shutter.

Claims (1)

[Claims] 1 Equipped with a burner and heat exchanger that can change the combustion amount to large or small,
A plurality of combustion gas passages partitioned by partition plates are formed in the heat exchanger, and a shutter is provided to open and close at least one combustion gas passage depending on the amount of combustion. A heating device configured to reduce the area.